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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '969ad11c8fc4f148c93077b7f265c2b436274d14940b19ac4ff50d53a15d54fe' 
  AND token = 'nzsQyd5NrND1BQ3o5Avna4co5JvBVEGW18WhtFsu9O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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