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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f665ae321a376e858b3df62cab14c0234bce3e414624cd7030b4e17f6a53ced3' 
  AND token = '1vwCGp71w9NnNjfuW010UsYliWm+ZCl7oHUnd+xT5mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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