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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26ea06b800024707fde7da3912ce4d1aca75336f1b306cd1e2a803c88e3662ff' 
  AND token = '4/FZ9RbyZdNi4Wwmwxafh4btTYQCnVoxQToOKz70RTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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