SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '069e9ed9925c60e2cefe33ffcec78c4c4df79f481eeff859f8d97375b013301d' 
  AND token = 'yMHoXDZYmnOV07eKVDjhD2v5FxqQRajiG3OwBNagkYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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