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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8a7fb10e726b729a0818f18564cab2b04248357db8c37b2dd29546e763d302f' 
  AND token = 'nSK8YrxeuwlJYoOW+lTJjXx1PcxDM1+CWByOIyfs7QQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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