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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95980039e578ae4db544b5444b6b09340c0c9e148b93cb08d1f19132ab006f5a' 
  AND token = 'xhFxWEoayJcqEW0fOeBxRqC3pKj6vuSgSWxK2qCD1tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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