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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '584cc344d05a58bb34309583211f08e7fa91865f50ccde24bbab59fe0bb72df2' 
  AND token = 'hHWiZJf17rVDltlRc6io1KQdCoB/PAtcuWikgHdcIZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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