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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebd4655f19811c4826857f051752291122a3b9f15833818b5f02abec81b6e3f0' 
  AND token = 'NPKub4b1itrWcCjZ79E7HBKYVvgwx6nrQ5prLQ0LcFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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