SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9467a1bd976fb67317aa0c35312e3c4024d6cd01a269540c86aecb053b4c76d6' 
  AND token = 'nh3rRs4+Irgji/ATZvhHtT5gZAAKV/BLVBZykWXRBZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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