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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08637c793ad11819b19fd993421deba3df9121ff58b74d60b27f896eb8d2e4ae' 
  AND token = 'iw4EPP5xVL2p2YJy6SvIUzQ43tbKSjdLn2GdKOxbL1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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