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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f17e1564b9494605eca105d116fbf64bb775e99acd9a060a144fe6d81205bb4' 
  AND token = 'vFMeuiGIRvlk9zABUG5OUsFFd1B3eKpBtNZZCEYZv+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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