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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad1c0590ecfbc0ed0c76d76df9f3520401d72af9f9e211ed309d4bc99a01a4ea' 
  AND token = 'BnStmqsi1LTCw9Gm2m7Hu4FnXgs8KvpJljiDJ6IMyW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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