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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd422ca7966177c292b41d920e6e8b96dea6742c61d1abc8f63e2ecb517699324' 
  AND token = 'mHdoNPJS4B53Cs3hzWa+7jEG74ZjYA7R/u7SvvIICbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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