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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd94acda7ce89ba481a5cac56421341a1b066c09dfe83b6923174ab4961bf1262' 
  AND token = 'L0urBU9YnPoqqRyzZ0iVRBBAynGhgLg2KSdLrOaihkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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