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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '568b00e99a4edd02fec7e68b2567f1c20cdea071665f05a359e3badb2476bf12' 
  AND token = '5IoY3n+ZGHhWj5/mrAZ/Rh/daIZ1yoWkoCTcIf4kDHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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