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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2461dd70c438dd9d407cecdbde84d5a1cc98ee3d44760fdc5dd37c4f39f5221' 
  AND token = 'Z7IVbHWnmfHsGLkcdLys50ef9PqSTfyAHo5XqDjGvOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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