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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce30a5c84bc22624fbf98a8a57a2707f2a3a2031b34f90d59c588c6cf4a4b9c3' 
  AND token = '3AIIwQMF2CWi6BqCcnL5+lWVgv4h40knlRPn+eF2sgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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