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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1396b0b127f779b9c3b037005252856844dbcde3ba79bc4132122e9b8b8d14d8' 
  AND token = 'GcsyK8DaDXbhNqlHK33INccvHmlCW1md0XiGpF+2tZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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