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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83bd2f57c06be16d882a00c6ec001890d315699762e475eda32cf81d1d292aeb' 
  AND token = 'tKo/xGCOCTKMMD1YgOkKV47fVY8WDWmRI6u/HnRa3ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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