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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74cdf099176d1066ee8aa307b7547100e42881b12a727aec000289c707837a19' 
  AND token = 'Ou9oz6z5q66h7FthPuQ0hgb5faOMv98Ow3lM4lZcvVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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