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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1b4c832a46405f54c43fb71b19492108182a58ad73822ad28dcfaffc281671e' 
  AND token = 'G45CzOfY9+7rouoaWC6Ejbw4aI6+EX14p/0Gry5qIms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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