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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edec31fb0f4e1c02d7f5340e2ae7935f8c017473a1a847ef0d4aaba6ed4f6c0e' 
  AND token = 'yQ07Iaxc/gi71Qs47k7nwuVKIwSQsVoOXoU+vlcHG6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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