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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c937198fe737a9d0e8d275ccc7f0a91ebbe8e52b13764c7781e1a108457686b4' 
  AND token = 'id0sK5guBf8foXy5UBlP/Jsz7VJXb56KhsCkMw5ZIpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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