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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b90605e82d5b67b1aa850a19f7900e2a285b665424be590be1fd338f0c37c62' 
  AND token = 'WtbpWb0dB8+EfpFVQfpO3VXayz2eGfnHSVnvpYL6/7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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