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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a30620437e523bc504cd8de0026880bed5d7f1fc77880defe235dc5e8110a55e' 
  AND token = 'lRT+99hQK6bqOg5MGiORB5l526RrLRDdm9rz5Ul8/0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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