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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c3b430d68515d2e1b82be0fc08f39327c91afc84e4b5a178d75ed79711687ff' 
  AND token = 'kegDszwZW5zfU+mfXl3QF0aCke7FCDqhiqaP7W154gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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