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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91afc04e7503d1bbfcde72d4214a570faa0865c74bf84f1ebf297864ea044f9c' 
  AND token = 'D2Zbj9x421q/mFI6LwufbTR66BsJZnt+878Aq7XB5ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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