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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eeb4d92682993defa33e74d43c670a36dcbf41181e3bcedfe77871de4c168db' 
  AND token = 'SmH/+bJxwsKfslUGF48mDbSZ4Q6cUdc/f3FMW1O+zws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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