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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa5bba636a338e5cf5cf2251336130bea28b688c42eb85ec785e1eaa34332e1f' 
  AND token = 'S61UFu3xaHqU2cxRPwGRfBXq8fJUJ5Jay8214xBkodQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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