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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa9bba70e7109203606a09889218d7b5ef7f952d150353f55a2d84dead48a848' 
  AND token = '608iLbIarQ+0IRTN3/qllRMbtInTQZ+ayRj65iFaqd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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