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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '415fc9e194d86ce4abe2259be6658c3c50fa5d7ae69bb0fb072cbfa266fee791' 
  AND token = 'XlD0kXsAr7fDNi3BLyDQ3w+lkW85P8cJESb1iSyj/kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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