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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '851d5714475e1e764541fd93f338f9cfd9d34bb7ed4a5ab73b3e0c9b8376eda8' 
  AND token = 'Ua/7CiFxF9cmKgX1UawOp3wh1A3AJJIqRrPE5xsoebs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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