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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5add9a04034003ee2ad658a762915ff924a7b3d3d15cf8c1eb6629ac30413c1e' 
  AND token = 'EgofXJSEaeb/StS4nNp6/US11JcsCz4KYykOba8OecI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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