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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '232b9325ba5c70373d8c1ee2bd5fd37c74428b5ef022fdd0a878367c372b64dc' 
  AND token = 'uSgqU/x2vu5nVEmxMBMbN52c4dGQ56viBYdSm3BTQf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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