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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f34d9aafe8990d188bf450dae6296d07da2d93f9df3f5037b4c0ea0e3936b38' 
  AND token = 'vut1DrWehTRzKhvUQyg8b+lv5VjK+h5Dwhex8Y5h+8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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