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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f410af046be42b30af10acb6ba15e0680b6ae0060a8d8799107777aad79fa19' 
  AND token = '79YKNire5w1ltOW6Iu24YLOoYdxe/XTHA6kKfVxEFwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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