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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89027549d9911efd92d911a78c6df742775e9f61c82120ae7226ebe5b5c7fdaa' 
  AND token = 'tCWvtTpLNuafixt1W2nj9d65RdCHi0iYdWnd1C83Haw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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