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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc7b6ac64a27affd5c5462dfbd00018eae04416556bcc3263e77a49a939f0741' 
  AND token = 'go7Q2jOiFxv8RpjFwTm+qGGtTf4Q55zeNruSX+ve6ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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