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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ae7dfaa6114918d1edfc8ef93c95ee2b4c4698c182286645e110ef02fd3bcb6' 
  AND token = 'Av1CH7AHbzBJPLFfM9WUsaFwF81TmC/sqYhg2cO+A7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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