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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '667decfd56fe669179c7ab62e5e563cba163520b68d219d8711a39fee151163c' 
  AND token = 'vPrHoeNn/lskjtAysJ2RZ8THie/44MufBE+VvJM2Gmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}