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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '193820c98868562b117fdcd46252b6266684dd26b46ed311d7ff83dde0ed3dab' 
  AND token = '9AHeK8thEadTHnOXo0ktHZdTr8cyqAFFY+/Wu7d6DbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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