SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d1a9e6420b9432644b841e938c62359eac9c834fe07f7804a57ffc7be6853fa' 
  AND token = 'EnJYVYZPwqFK1CY5le7QfoNKz3jMHKq30WHb9XgMWhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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