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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93d2b7fd82f2015195e7688d0a9ae35c8a955834cfea7081c7d6a9b6cbded776' 
  AND token = 'PlalIg2JxDDnb3FkgkS0pdBawn33tpCod1TkA9n3jhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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