SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54a08adc35c12fb5c12a2178a1722f22d754a4e87759fc94c965c59e99a23bac' 
  AND token = '62UYK6vVkU8FLT7gP5VCHGhVowNTzwyS/BrcMjheOoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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