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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8968b5fd6436c770b843b44b69917e2680ce9a1f28c4f0c63db1efd6a963f365' 
  AND token = 'LPAVa/0qcLNSTHf96PuhNjje6Yn04+EAFGG1PwRYVn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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