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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '701eea1aa151cf16bf2ce8bf587b8d9d63e37a9d88b5f813f4409b8aa46bcdff' 
  AND token = 'OK7BJzkYl1SkNg60nvn0P0m9NtcMrS1kAgAmm1JwH3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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