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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30ad85544745b53dd68abb26e2f3c82ad49840b65c5cadff3257e5646cda6c0c' 
  AND token = 'VniODmEkc4NE93vbR9f7I+ziJQ85MJ6LkI3SoyujDkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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