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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a915f6dabdc7585d503342bae3e6f75f9cce2cc9c85a6b03cf80ab567540abcc' 
  AND token = 'k44BTvDfQ2rwMkQY+7QCr+TOd2wigKcQUOkQzAx0BIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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