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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '712548a814e7e34f93d1a1568ddb27244e38d32d99239236e05fa03ad7c32c0a' 
  AND token = '4qRingJnJtmee8pw94WYpPKvsNT5NaDJo+g623XXXwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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