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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25c2f825efd7b26731456bf21e7e2b3d32199fed6a545e51950428475e5b7d14' 
  AND token = 'SpqbQ0JrJ4DO6u3vZVjtiEBo9YQ7k0vp6lA/LuaaO1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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