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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6c6605a57b21c1f008ae7e5ae4fd698d2b1551c07d3c9398914ec0f6486ea7d' 
  AND token = 'Ifx6VrerCfn/hCfznk75CNkucGMoLyKh7Y9cBebHkVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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