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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6bca9f96de2b856c5ebbbc8c63e2e025aa0c8b37f909c033cdbdf1dd70b0429' 
  AND token = '99QITUX30oXYn09iLcj/onSce11jRsw1vQ4gM9/VI00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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