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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a2f1b89466de1b126fed74647dad163da4ade6ee1ddebc312fbf40bc6137cb8' 
  AND token = 'AHLHrmD6BQe7lTRNwZ8trz1r9J+cflk4FGo8ToUC4/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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