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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e45175f752f3686c2dd9385739a4202693fff87f90fcfa294b6e2cc4f7dadbd9' 
  AND token = 'cdh1ypcQI08/sHDp3lHyMeqzpInbUnF3rLQyL8HzaN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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