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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b1ec9a916b3ab1a25f47abb4ca0eddb94679f7a4ea0cfc1f4481a84be498d2f' 
  AND token = 'G/XzSzi2xoye7ydrpGH/TTnQ0MzjGh7kLSmBv8XH1wM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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