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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05d777c006b4f0b1215c435a792aa32280e612ba85fedc1c56bb365541121e98' 
  AND token = 'KOL2JvYG9DHLIMiE3Ro5qmcRDwD4DIf2Hm+NHvs5d0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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