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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82dbe59818b88ab2e4b7774203d3454db707cc3a03b6dff158179770c4b56cc1' 
  AND token = 'w683Tsq3CM1EltsV0z2T248B92uPzQuIUuRC3nN+nII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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