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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dae259fb3e86075692940c5b5ac5023cba3b69d3232a5759130da86f87945115' 
  AND token = 'C2po7tEzhFH0lgnmo5FpyaAEcEteUXmkF6wD3YsTzHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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