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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6733744d5a1e48a9f13c19c6c9818984761de84e0eb6d70ace756c94167fe9e3' 
  AND token = 'yvm3O9J59HHKtAZ6jqMOHVLap+BYe7CDfYgIegjyTX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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