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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '391912092c7741dc9cb1eef8de4213446172cd32bdac93bbecb215c152032432' 
  AND token = '3wX9SBYS4QN0NB645EqpUxTpCDQZC9Oxzc3Zxk9H2Pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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