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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7b957a49d5d6fd08635acf93bfc6550058024b91d6d92c9c67fc6468f07b4ad' 
  AND token = 'CWl5kTAsXGxjOVixXkfAJS1tS2wl3RnGc2uSsQlFfo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00115

JSON explain

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