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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0fa3776cf825d8548f59d4bc60c6f1c9eb9d8f3602b50c7e599707be7ae3500' 
  AND token = '/A+Ouzq3UXwB8FOTkjrho97kj0FAcVWxrPg6J9faUko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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