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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3d6d82ea7a021f2c85e05d1c94dc40c5fdc3f8e03d095502e15c2910dbe630b' 
  AND token = 'y/Ajq5495HJu8XQ9wEIIKluqQXStHZqM3Rz9SUNAH1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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