SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58f41dd2ce530ea94f5328bf6561999c4f067cf93d711b2d4d7bf99f9ca217d9' 
  AND token = 'kw74xBtzDz/36BL+WfqOgCif+GRcpE7CFv4r0MTvhrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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