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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10b4e3ca8d547ae82ffdabe45f07d79b50c300c34f4eae6ac28e39cc616a4954' 
  AND token = 'rBrwCqIGf79wKDiiQF+dNnMEjIJb0eix3wUXBaY9EkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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