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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a01b009f1f3c8a36e7433c3d9d21cdde1ffc6f7cc3e62f3d1afe94e332df884' 
  AND token = '7c8xB+nsI5hkP84RyG/wVwEBPnUduZ16EPSeJTcUTXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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