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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96d1ad1cbe5bb8bf30d27082ea80b2720d277b45c734ab41099db432dedbb1b8' 
  AND token = '0Wrm8Wg4HNEtDZBI54jumXiVmsua1ZsuR9lFQVoBKyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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