SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74c9bf91f1c4ab909e81d9d5af7f72562888e687bcadb5653f44e132c4a38b9d' 
  AND token = '1VlJKC3RmN/r9MAF90vRWvw/Gh+O5+Rcgje6lsTUt2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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