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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd30d13d66be3a1392618627b3203fe4ba36356d871d6dd05d79b68debe81583e' 
  AND token = 'OpDIH+iAVhcadzTqbSaOIJMG/Z1hth3B97YeNJ1t7bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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