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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '394e20c37c3a6c408ccfa932e7a502aa52184a2b9b8010ef2455a3a7906fc644' 
  AND token = 'ltEvzp9azqQHd2ndT6Rqm7EF6Paf78GmgIxxrpukz7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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