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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '471794a311a583ca0234c81e5d5e8bfa8ea0006ed00b91a1dbddb34bcbe9c387' 
  AND token = 'x2B/o/9uaKBH4f6hMvnioptKJhDIu7D92r4MtpAJY/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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