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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b598aa0efe991589bfb0a268a3480c84919ea7c14c7fa254d44292209f866cf' 
  AND token = '0ZGkY6gYXFXzmsSBluY00Rx3H8s++n22zxdGYPev0SM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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