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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01b97bd02f86e33e465cb2b3bda97d5baec5db70c6fe23d1b538813573dbff05' 
  AND token = 'b0JwFCP+KFXL57ZrMyMfffS3omgNQOqs4TBaA1pPogY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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