SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d26d15d6bbf9da85756d2440eb03a79648475a5bc58337892dd54b175372744' 
  AND token = 'wSA7wR7SPdt4dC6q64vdl6rA05xDdc6ZvFLVLXgZe7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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