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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85f8741b6ee9b344d5d2af597f85864c2ffb3a3bfef33a78c776f43e1c0d1fd0' 
  AND token = '9/MIBJbv5N4utmxoaB9o61dfWUg5XOUfOLLl5l1ruH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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