SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdc3b698b748ca54d135b79e036891f728d849ddb57aedb714b29fbece2d74aa' 
  AND token = '6UEMzBS4myl60dpvMJU+afLRpz7/VRI0uDDogGlSVgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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