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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a19116e67f4d965bcfa87a8ca35d2a1071f74e56e6d9caebfca52d5b5fc90ec3' 
  AND token = 'apOxIbq3JoIlz2A/uEagkgizCqP2+WaLH60u+iPhS48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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