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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '198936cd64e80210889cb9a77b3d9ec301e4a38484bcd32d22cc1441eec34d7d' 
  AND token = 'Y/DWYrAlEmVIfL19T4scEFCka6s/cXcwDIofbdTHkCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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